diff --git a/quic/core/quic_versions.h b/quic/core/quic_versions.h
index 3151fa2..828e73d 100644
--- a/quic/core/quic_versions.h
+++ b/quic/core/quic_versions.h
@@ -367,13 +367,15 @@
 // handshake_protocol == PROTOCOL_QUIC_CRYPTO, in the same order.
 // Deprecated; only to be used in components that do not yet support
 // PROTOCOL_TLS1_3.
-ParsedQuicVersionVector AllSupportedVersionsWithQuicCrypto();
+QUIC_EXPORT_PRIVATE ParsedQuicVersionVector
+AllSupportedVersionsWithQuicCrypto();
 
 // Returns a subset of CurrentSupportedVersions() with
 // handshake_protocol == PROTOCOL_QUIC_CRYPTO, in the same order.
 // Deprecated; only to be used in components that do not yet support
 // PROTOCOL_TLS1_3.
-ParsedQuicVersionVector CurrentSupportedVersionsWithQuicCrypto();
+QUIC_EXPORT_PRIVATE ParsedQuicVersionVector
+CurrentSupportedVersionsWithQuicCrypto();
 
 // Returns QUIC version of |index| in result of |versions|. Returns
 // QUIC_VERSION_UNSUPPORTED if |index| is out of bounds.